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Simulations of spatially evolving compressible turbulence using a local dynamic subgrid model.

机译：使用局部动态子网格模型模拟空间演化的可压缩湍流。

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摘要

A new dynamic model for large eddy simulations (LES) of compressible turbulent flows has been developed. It allows the model coefficients to be calculated in a localized fashion. The properties of the model have been examined in LES of decaying isotropic turbulence for a range of Mach numbers and Reynolds numbers. In the limit as Mach number approaches zero, the model reduces to an appropriate incompressible form. In the compressible regime, the results agree closely with data from comparable direct simulations. For a fully developed turbulent flow field, the modelled subgrid stress tensor was found to satisfy all of the realizability conditions over a vast majority of the domain. The model was then applied to LES of high Reynolds number spatial mixing layers. It was determined that in order to obtain good results for such a case, the numerical scheme must be minimally dissipative. Otherwise, the physics of the flow, specifically the viscous and turbulent stresses, were overwhelmed by the numerical dissipation of the scheme, resulting in a greatly decreased mixing layer growth rate. Therefore a scheme was developed which has very little inherent dissipation. Even with a relatively coarse and highly stretched grid, the results from this scheme were in good agreement with experimental data.
机译：针对可压缩湍流的大涡模拟（LES），开发了一种新的动力学模型。它允许以局部方式计算模型系数。对于一系列马赫数和雷诺数，在衰减各向同性湍流的LES中检查了模型的特性。随着马赫数接近零的极限，模型简化为适当的不可压缩形式。在可压缩状态下，结果与可比直接模拟的数据非常吻合。对于充分发展的湍流场，已发现建模的亚网格应力张量满足绝大部分领域的所有可实现性条件。然后将模型应用于高雷诺数空间混合层的LES。已经确定，为了在这种情况下获得良好的结果，数值方案必须具有最小的耗散性。否则，方案的数值耗散会淹没流体的物理性质，特别是粘性应力和湍流应力，导致混合层的生长速度大大降低。因此，开发了一种固有损耗很小的方案。即使使用相对粗糙且高度拉伸的网格，该方案的结果也与实验数据很好地吻合。

著录项

  • 作者

    Nelson, Christopher Cedric.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Aerospace engineering.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 268 p.
  • 总页数 268
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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